Answer:
Phrase
Step-by-step explanation:
"In my room" is a phrase, not a clause. Clauses can stand alone as their own sentence. A phrase is an incomplete thought that needs either a subject or a predicate/verb. For example, the phrase above can be used in a sentence like, "I was singing in my room." This makes more sense because the subject as well as a verb (both in bold) are present. There does not always have to be a verb in a sentence, but it just depends on what you are writing.
Hope this helps :)